Tool supporting and operating fixture



. 6,1932. H. w. ZIMMERMAN 1,845,069

TOOL SUPPORTING AND OPERATING FIXTURE Filed Nov. 4, 1927 4 Sheets-Sheet1 Feb. 16, 1932. H. w. ZIMMERMAN TOOL SUPPORTING AND OPERATING FIXTUREFiled Nov. 4, 1927 4 Sheets-Sheet 2.

Feb. 16, 1932. H. w. ZIMMERMAN 69 TOOL SUPPQRTING AND, OPERATING FIXTUREv Filed Nov. 4. 1927 4 Sheets-Sheet 4 illnlllllllllili l atented Fella.18, 1932 v n n7. aw r n ss, or SHICAGO, ILLZNG'IS, AfiaIGNCR soAesoniorrvn MAIN- rnivanon amenities- 00., or onions-o, rLLrnoIs, ACGR-POEATEGN or ILLENOIS TGOL SUPPQI-JllNG AND GPEEATIEI FIXTUREApplication November 4, 1927.

My invention relates to a portable tool supporting and operating fixtureand has to do particularly with a iiXture for supporting and operatingcylinder grinding tools.

it is quite usual practice to equip garages for the grinding of thecylinders orautomobiles, and other, engines. This grinding is usuallydone Without removing the cylinder blocl: and the character of the menism ordinarily employed is such that it is y tor the operator to holdthe grindnecessii ing tool and its driving mechanism in his hands vvhilestanding directly above and over the cylinder to be ground. Thispractice is time-consuming and en} ensive and requires considerableskill and places a great burden on the operator because of the necessityof supporting the entire Weight of the grinding structure which tends torapidly tire him and impair his skill. Also, the torque of the tool,Which is usually electrically driven, must be borne by the operator,tending to -revent the desired accuracy in grinding.

action of the grinding tool is not unif and there is danger or itseizing and s ing which results in throwing and inj g the operator inaddtion to the pos s' ty of injuring the tool.

Various forms of apparatus have been devised in attempts to eliminatethe foregoing ectionable features and provide more ofient and economicalstructure but Without success because such previous structures requir anong other things, readjustment of the entire structure to each cylinderto, be c o d which occasions much delay and ad ditional expense andlabor; they are buliry and must be moved about as unit and not easilyand quickly adjustable.

Cue of ti e objects oi my invention is to provide a highly efiicient andcomparatively .ightxveight supporting and operating fixture r rovercoming all of the foregoing, and any or, objectionable features inprevious cylt or rinding mechanisms, such fixture heg y simple inconstruction and cheap manufacture.

Another object is to provide a fixture of the above character which isadapted to easily align the grinding tool cylinder with the Serial Ho.230,874.

tool driving means, and which is capable of adjustment- Within itselffor completing all or" the grinding operations as to all of thecylinders. with only one settin or positioning of the speed ofoperations and very greatly the burdens imposed on such op- To this endI provide a separate base part adapt-ed to be securely fastened to thecylinder block and adapted to carry a radial support including compoundswinging joint members wh reby the tool may be adjusted line and/or onan-arc,

on a straight and in fact, in all directions over an area er'ceedingthat or" the maximum size of the c:, nder block o be ground.

further object is to provide such a fiXw which is composed of aplurality of posiy' acting, but readily detachable, parts or units whichmay be readily and quickly assembled and disassembled Without tiringeilOlt. 7

Still another object is to reduce the time required for completelygrinding a cylinder and to grea ly reduce the cost of the cylindergrinding operation.

Additional objects are to provide a grinding or cutting fluid reservoir.Within one of the supporting standards making the fixture more compactand efficient, such reservoir being in adjustable communication with thecylinder to be ground; to provide for rc'ady ad nt for tools ofdifferent sizes and lengths as ell as adjustment of the length of thestroke to accommodate the mechanism to all sizes and makes of cylinders;to provide means for manually or mechanically moving the grinding toolback and forth in the cylinder and, in case of use of manual means,which may take the form of a handoperated lever, l provide means foradjusting the uppermost position of such handle for convenien operationby the operator: to provide a sui t for the grinding tool drivingmechanisin "ii-'hich is adapted to receive and carry various types andsizes of such driving mechanism; and to provide a novel form of clampfor simultaneously securing all of the swingable supporting parts in anypredetermined position.

A in he fixture as Whole, thereby increas- Other and further objects andadvantages will become apparent as this description progresses and byreference to the drawings which show my invention as applied in thegrinding of an engine cylinder and wherein,

Figure 1 is a side elevation partly in section of a structure embodyingmy invention and applied to a cylinder block shown partly in section;

Figure 2 is a top plan view of the structure shown in Fig. 1, the partsbeing shown in full lines in one grinding position and in dotted linesin a different grinding position;

Figure 3 is a side elevation partly in sect on L p of the base of thestructure in separated relation;

Figure 4 is an enlarged horizontal section taken on line 4.4 of Fig. 1;

Figure 5 is an enlarged separated side elevation view of the toolsupporting bracket Figure 6 is a front elevation of the structure shownin Fig. 5;

Figure 7 is an enlarged side elevation of the radial arm shown inseparated relation;

Figure 8 is a horizontal section taken on line 88 of Fig. 7;

Figure 9 is an enlarged. side elevation partly in section of a form ofdrive mechanism for actuating the tool supporting bracket;

Figure 10 is a front eleva ion of the structure shown in Fig. 9;

Figure 11 is a top plan view of a portion of a cylinder block showing amodified arrangement for clamping the fixture base thereto;

Figure 12 is an end elevation of a portion of the structure shown inFig. 11; and

Figure 13 is a separated perspective view of one of the clamping blocksused for securing the base as shown in Fig. 11.

Referring to the drawings. and particularly to Figs. 1 and 2. thecylinder block 15 may be of a form usually employed in connection withautomobiles and may or may not remain attached to the automobile whilethe cylinders are being ground. Any desired type of grinding tool may beemployed, but I have shown and preferably employ a grinding tool 16having grinding stones 17 carried by radially adjust-able supports 18which are, in turn, carried by a suitable frame having an upwardlyprojecting cylindrical coupling 19. This coupling 19 is hollow and isprovided with rather large and exposed bayonet slots 20 adapted toreceive the lateral pins 21 carried in the lower ball-shaped end of thedrive shaft 22. Vith this construction the drive shaft is free to adjustitself vertically and angularly relative to its axis to provide anadjustable and non-binding connection between the driving mechanism andthe grinding tool. The driving mechanism which I have shown is a form ofa motor-driw'cn drillope'rating device 23 which has a coupling 21similar to the coupling 19 attached to the lower projecting end of themotor shaft, this latter coupling 24 being adapted to receive theadjacent end of the drive shaft 22 in a manner similar to its engagementwith the coupling 19. It will be understood that when I refer todrill-operating device I include any motive means capable oftransmitting rotary motion to the grinding tool 16.

According to my invention, the grinding tool and its driving mechanismare supported and aligned and actuated by a radial and universallyadjustable mechanism which I will now describe. The cylinder head (notshown) may be secured in place by a plurality of studs carried by theblock 15 or by cap screws, or the like, removable with the head. Inadjusting this mechanism to the cylinder block, the cylinder head is, ofcourse, removed, and, if the cylinder is of the form shown in thedrawings, only one or two, if any of the head holding studs need beremoved. Some cylinder blocks may be of such construction and thecylinders so spaced apart that none of the studs need be removed; andthis is true as to any other parts of the cylinder block which may beassociated with its upper face surface. In grinding of the cylinders Iemploy a separate fan-shaped base 25 which is long enough to extendentirely across and beyond the side edges of the top surface of thecylinder block 15. The flared end of the base provides an additionalbearing surface upon the top of the cylinder block, the flared surfacenext to the adjacent cylinders being shaped to the curvature of thecylinder l)0lt: so as to provide a maximum supporting surface withoutinterfering with the grinding operations. This flared surface isprovided with a vertical hollow cylindrical portion 26 which will bereferred to more in detail hereinafter. This base is provided, near itscylindrical part 26, with oppositely directed slots 27, 27 and 27. Theslot 27 adjustably receives one of the cylinder head holding studs 15,and it is securely fastened thereto by a nut 15*; or if cap screws areused for holding the head, a cap screw is passed down through slot 27 toengage the threaded opening in the block provided for it. At the otherend of the base, I provide another slot 28 which adjustably receives theadjacent stud (or cap screw) 15 secured thereto by the nut 15. If.desired, a stud or cap screw need not be used for securing the latterend of the base, but a U-shaped clamp (not shown) carried by studs orcap screws at opposite ends of the base may be employed; or depending onthe construction of the cylhider block and spacing of the studs or capscrews, the base may be secured by passing the studs or screws throughthe base slots 27, 27 and The base 25 is, preferably, located at or nearthe central part of the block, but the range of the fixture as a wholeis such that, if found deur a...

a adapted to fixedly receive a vertical cylindriwise.

cal bushing which serves as a support for the radial arm 31. This radialarm is provided at one end with aspht sleeve 31 having at the splitportion opposed bosses or clamp elements 32 and 33 provided withopenings, the opening in the boss 32 being threaded to receive thethreaded end of a clamp screw 34. The opposite end of this radial arm isalso provided with an integral split sleeve 35 having opposing bosses orclamp elements 36 and 37 adjacent the split portion to also receive theclamp screw 34. This clamp screw is adapted to pass freely through theopenings in the bosses 36 and 37 and thence diagonally through a slot inthe central part of the radial arm 31 and engage the bosses 32 and 33 asabove described, and such clamp screw is provided adjacent the x bosses36 and 37 with an enlarged cylindrical part forming a shoulder having ahandle 38, and this shoulder cooperating with the threaded end of theclamp screw serves to draw the split portions or" these sleeve partstogether. This arrangement facilitates very greatly the assembly anddisassembly and swinging adjustments of the operating mechanism,particularly when this is being done'by a single operator. It enableshim to uniformly adjust these sleeves for efiecting the desired swingingmovement of the radial arm and its associated parts as Well as enablinghim to simultaneously clamp these parts in their adjusted position readyfor the grinding operation.

The radial arm sleeve 35 is adapted to receive and support the lower endof a hollow vertical and cylindrical post 39. The lower end of this postis closed by a plug 40, or any other suitable means, to provide areservoir 39 which carries a supply of kerosene, or other suitablegrinding or cutting liquid, to be fed to the cylinder during thegrindoperation to keep the grinding stones 17 clean. The top of thispost is closed by a cap 41 so that the mechanism may be transportedwithout spilling the lubricant and to preven loss by evaporation, andother- A valved nipple 62 (Figs. 1 and 4) is carried by the lowerbracket and is in communication with the reservoir 39. This nipple alsocarries a flexible conduit 63 which delivers the liquid to the cylinderat a rate dependent upon the adjustment of valve 64.

The drill-operating device 23 is carried by a (Figs. 1, 5 and 6) bracket42 having a pair of vertically spaced arms 42 and 42 terminating insleeve portions 43 adapted to be passed over and slidably engage thevertical post 39. This bracket 42 is additionally supported and guidedby another cylindrical post 44 which is carried by the post 39 by meansof a fixed bracket 45 adjacent the bot tom of post 39 and by anadjustable bracket 46 adjacent the top of such post. The arms of thebracket 42 are provided with intermediate sleeve-like portions 42 and 42which slidably receive the vertical post 44 as shown clearly in Figs. 1,5 and 6. The lower bracket 45 has a collar or sleeve fixed to the post39 by pin 45 which serves as a shoulder or stop engaging the upper partof the sleeve 35 to position the post 39 vertically therein. The upperbracket 46 has a reduced sleeve portion 46 which slidably receives andis guided by the upper part of the post 44, and an adjustable splitsleeve portion 46 which embraces the upper part of the vertical post 39.This sleeve portion 46 is provided with laterally projecting lips47 atthe split both of which have openings, the opening in boss 48 beingthreaded to receive the threaded end of the clamp screw 49 (similar toclamp screw 34) for tightening the sleeve in adjusted position upon thepost 39.

Springs 50 are attached to the opposite sides of the upper bracket 46and to the bracket 42 for normally supporting the latter bracket in itsraised position when the apparatus is at rest, and also serves tocushion the upwardand downward movements of such bracket, respectively.

To reciprocate the bracket 42 and its asseciated mechanism, I may employa manually operated control lever 51 which is pivoted at one end to thebracket 46 as at 52 and has a handle 53 at its other end. Intermediatethe ends of this lever 51 and, preferably, near its pivoted end, Ipivotally attach a connecting link 54 which is also pivotally at tachedto the lower sleeve 43 of the bracket 42. l/Vith this construction, itis obvious that by swinging the lever 51 up and down about its pivot 52,the bracket is caused to reciprocate.

I preferably employ an ordinary form of drill driving and holding deviceas the means for imparting rotary motion to the grinding tool becausethis is a common tool used for a great number of other purposes inconnec tion with garage work and which may be found practically in everygarage. These devices vary considerably in size and shape, includingheight and diameter and weight, and I have, therefore, provided auniversal mounting for the same, or other similar mechanisms, which maybe used, This 1) of usual form which engages the rear part of the outersurface of the drill device, and which, in some instances, serves as ahandle part. This threaded stem is adapted to receive a lock nut 61which when drawn up tightly in place secures the cylindrical drilldevice against and within the V-shaped arms 58 and eliminates thepossibility of lateral or vertical displacement of the same. TheV-shaped embracing portions or arms are so shaped as to snugly receiveall types of drill holders and the vertical slot 59 provides for theproper anchoring relation regardless of variation in size of the drilldevice and variation in location of the stem member 60.

lVhile I have shown and described the grinding tool as driven by anelectric motor, I do not desire to be limited to such driving meanssince it is obvious that the motive force for actuating the same maytake the form of steam or air pnssure or any other known motive means.

In adjusting the fixture for operation, the base portion, as a separatepart, is .[irst mounted upon the top of the cylinder block as abovedescribed. The radial arm 31 is next placed in position upon the base25, as a separate piece, after which the vertical post 39 with itsassembled parts is placed in position upon and within the sleeve 35. Theradial arm 31 may then be swung about the bushing 30 toward the cylinderwith a compensating rotary movement of the vertical post 39 (and bracket42) to bring the drive device 23 directly over the cylinder and alignthe same with the grinding tool to be inserted in such cylinder. Oncethis adjustment has been cffected, the clamp handle 38 is actuated tosimultaneously clamp the sleeves 31 and about their associatedmechanisms to lock the same in their adjusted positions for the grindingoperation. It will be ob'ious that with the foregoing compoundadjustments, the grinding tool may be moved in a straight line fromcylinder to cylinder or moved in any other desired direction to properlyand accurately align the same with its driving mechanism and supportingstructure. One setting only of the base is all that is required tocompletely grind all of the cylinders, regardless of their number andregardless of the number of operations to be carried out.

To further adjust the tool 16 for grinding, the handle or lever 51 ismoved downwardly moving snch tool within the cylinder to the lowestpoint of the stroke which, preferably, is at a point where the toolprojects a slight distance below the cylinder wall, and an adjustablestop carried by post ll; (Fig. 1) is then moved up against the lowerpart of the sleeve 41-2" and clamped in place by its handle 55. Thelever 51 may then be moved upwardly to the desired height to determinethe upper limit of the stroke and another stop 56 carried by the post 44is moved against the upper part of the sleeve 42 and secured in place bytightening its adjusting handle 56*. lVith these limits definitelyestablished, the grinding tool is inserted in the cylinder and thedriving mechanism actuated to revolve the same, the lever 51 being atthe same time moved up and down, to grind the cylinder. In grinding acylinder, roughing stones 17 may be employed in the first operation andall of the cylinders may be rough ground before removing the roughingstones; after which smoothing stones are substituted for the roughingstones and all of the cylinders smooth ground without removing thesmoothing stones.

lVhen using the lever 51 to move the bracket 42, the upper limit of thestroke may be at such a height that the handle of the lever must bemoved to a height inconvenient for the operator and, in that event, thehandle may be lowered by loosening the clamp screw 49 ano sliding thesleeve 46 upwardly along the post 3) to swing the lever 51 about thelink Si is a pivot. The foregoing adj ustment of the sleeve structure 40may also be carried out (with adjustment also of the up per stop 56) toprovide for a longer stroke and to vary the upper stroke limit. Thislatter adjustment may also be employed for the purpose of varying thesupporting or cushioning effect of the springs 50 in the case ofvariation in. the weight carried by the bracket 42.

To further increase the speed of operation and reduce the cost of thesame and eliminate manual operation, I may reciprocate the bracket 42and its associated grinding mechanism by mechanical means rather than bythe manually operated lever 51. In that case, I may employ a structuresuch as shown in Figs. 9 and 10 which comprises a gear housing having adepending internally threaded part 65 engaging the upper threaded end ofthe standard 39. In that case the cap 41 (Fig. 1) is dispensed with andthe liquid added to the reservoir 39 through any desired form oftill-opening (not shown). The housing 65 carries a worm gear 66 mountedon a shaft 67 which passes through the housing and carries at itsopposite ends cranks 68 having dove-tail adjusting slots (59 extendingthroughout their length. The gear 66 is driven by a worm 70 carried byshaft 71 which is driven by any suitable power means such as an electricmotor (not shown). Crank pins 72 are adjustably mounted in the slots ofthe cranks (38 and one end of links 73 are connected to and freelyrotatable upon such pins. The links are provided with a plurality ofopenings 74 for receiving the crank pins so that such links areadjustable for varying the stroke of the tool bracket 42 to which theother end of these links 73 are pivoted as at 75. In operation, movementof the gear 66 revolves the crank 68 to reciprocate the bracket 42 andtool 16 inan obvious manner. Adjustment of the crank pins 72 and links73 as above described determines the proper stroke for each cylinderand, if desired, the bracket 46 and stops 55 and 56 (Fig. 1) may beomitted.

In Figures 11, 12 and 13 I show another manner of clamping the base tothe cylinder block. In the form of block 76 shown in Fig. 11, the studs77 at one side are spaced farther apart than the studs 7 8 directlyopposite. None of the studs are removed to mount the base, and to secureit I employ U-shaped clamp blocks 7 9 carried by studs 77 and havingtheir ends overlapping the flared flange of the base 25, the nuts 80tightly securing these parts in that position. The other end of the baseis secured by the clamp plate '79 which in this case passes over the topof the base and engages the opposite studs 7 8, the nuts 81 tightlysecuring such clamp plate in the position shown. Or, if cap screws areused to secure the head, they will be passed down through the clamps toengage the proper block openings. It will be noted that the U-shapedclamp plates 79 (Fig. 11) have their ends opposite the base supported byblocks 82 or other suitable devices to exert a more uniform pressure onthe base flange. It will also be seen from the foregoing that by makingthe base 25 fanshaped, it is readily and quickly adjustable to all typesof cylinder blocks in addition to the other advantages to be gained ashereinabove set forth.

From the foregoing it is readily seen that my invention overcomes allthe objectionable features in the device heretofore used. The structureis light in weight and may be readily and quickly assembled piece bypiece thereby relieving the operator of the burden of assembling themechanism as an entire unit. The compound radial action enables theoperator to easily and quickly align the fixture parts and drivingmechanism with the grinding tool and cylinder bore, the double clampinarrangement associated with the radial arm reducing the number ofoperations in this respect. All of the cylinders may be ground with onesetting of the base due to this universal adjustment of the fixtureparts thereby speeding up operations and reducing the cost of the same.The labor required to properly grind the cylinders is reduced to minimumand a plurality of cylinders may be treated to the same identical andexacting degree.

It is to be understood that I do not desire to be limited to theidentical constructions disclosed in the drawings because it is obviousthat various changes and modifications may be made therein withoutdeparting from the spirit and scope of my invention as defined by theclaims which follow. If desired,

a drill plate or base may be substituted for the base 25which has acylindrical part corresponding to the part 26 and in which the lowerpart of the upright standard 39 may be directly carried; or suchupstanding cylindrical part of the drill plate may receive a fixedbushing corresponding to the bushing 30 to receive in a like manner theradial arm 31 and its associated mechanisms, in which cases a drilling,or other, tool may be substituted for the grinding tool and the fixtureused for drilling and similar uses.

I claim:

1. In a cylinder grinding fixture, the combination with a cylindergrinding tool and driving means therefor, of a base adapted to besecured tothe cylinder block, a radial arm rotatably adjustable uponsaid base, a supporting standard rotatably adjustable upon said arm, abracket slidably and non-rotatably carried by said standard, saiddriving means being carried by said bracket, and means for securing saidarm and standard in any of their rotatable positions.

2. In a cylinder grinding fixture, a base having a vertical shaft part,a horizontal arm swingably adjustable upon and carried by said shaft, avertical standard carried by and rotatably adjustable relative to saidarm, a bracket slidably mounted upon said standard and swingabletherewith, a fixed bracket upon said standard, yieldable means forsuspending said slidable bracket from said fixed bracket when at restand an operating lever pivoted to said fixed bracket and connected tosaid slidable bracket by link means for positively reciprocating saidslidable bracket.

3. In a cylinder grinding fixture, a separate base adapted to be mountedupon the cylinder block and having a vertical shaft part, an arm havingone end carried by and rotatably adjustable upon said vertical shaft, avertical post carried by and rotatably adjustable upon the other end ofsaid arm, an- 1 other vertical post carried by said first post,

a bracket slidably mounted upon both said posts and adapted to move withsaid posts in a rotary direction, and means associated with said postsand bracket for reciprocating 1 said bracket, said bracket being adaptedto support driving mechanism for a grinding tool.

a. In a cylinder grinding fixture, a light weight base adapted to bemounted upon the cylinder block as a separate unit, said base having anupstanding shaft part at one end. an arm mounted upon said verticalshaft as a separate unit and adapted to swing in a horizontal plane, anupright standard swingably mounted upon said arm and a grinding toolsupporting bracket slidably mounted on said standard for movementtherewith, said standard and bracket being assembled on said arm as acombined and separable unit.

5. In a cylinder grindi g fixture, a brack st for removably supportingdriving means for a grinding tool, and means for positively positioningsaid bracket and grinding tool relative to the cylinder to be groundincluding a base carried by the cylinder block, a radial arm having oneend carried by and rotatably adjustable relative to said base, anupright standard having one end carried by and rotatably adjustablereiative to the other end of said arm, said bracket being dably carriedby said standard for rotary movement therewith relative to said armwhereby said tool may be moved by relative rotary movement of said partsto any desired posi tion relative to the cylinder to be ground.

it base 6. In a cylinder grindi'- 'f adapted to be carried by so thatits ends project of said block and having lindrical shaft at one havinga split sleeve sleeve at one end bein engagement with said supportedupon and rotat sleeve on the other end or" id tool actuating meansassoche standard, chnnping devices a the split portions of each of -.1 ia single clamping screw associated with the clamping devices on botlsaid sleeves for simultaneously seeming said arn and said standard inthe posi as to which they have been respectively rotated.

7. In a cylinder grinding; fir-iture, a base having an ups'anding shaftpart, a hori- Jociated with zontal arm having a sleeve at one end 215'rpted to receive said shaft part, a sleeve c: the other end of saidarm, an upstanding she adjustably carried by sait latte. sleeve,

grinding tool actuating mech nism carried by said shaft, clamp elementscan said sleeves, and a single clamp member engaging the clamp c u onboth saic sleeves for simultaneo I curing said arm and associated partst getla 8. A cylinder grinding 'ecl lixtnr ineluding an arm having splitat o npocite ends, clamp elements ca '1 bv the portions of each, sleeveand member engaging all said clamp e simultaneously swing the spi'; saidsleeve together. 7

9. A cylinder grinding toci fixture inci ing a fixed vertical shat-t, anarm b sleeves at opposite ends, one receiving said carried by saidcarried by the sp and a single Cltll said clamp elemeuh ing the splitportion; s to clamp said shalt {2 together as a rigid un..-

10. A cylinder grinding too ing a base having a vertical shaft post, ahorizontal member having sleeves at each end, such sleeves beingoppositely split, the sleeve at one end being carried by shaft part, avertical standard carried by the other sleeve, grinding tool actua ingmechanism associatsaid standard, clamp elements car- 11. A tool fixturecomprising a ase, an upright standard adapted to a swinging movementupon said base for movement toward and from the object upon which thetool is to act, said standard being hollow with a closed bottom toprovide a cutting fluid reservo r, and a conduit connected to the bottomof s: i d reservoir and having a valve therein for controlling the flowof fluid from said reservoir to said tool and object, and tool actuatingmechanism associated with said standard.

12. A cylinder grinding fixture compris ing a base. an upright standardadapted for a swinging movement upon said base for movement toward andfrom the cylinder to be ground, said stanc ard being hollow with aclosed bottom to provide a grinding fluid reservoir, and a conduit coinected to the bottom of said reservoir and having a valve therein forcontrolling the How of fluid from said reservoir to the cylinder beingground, and grinding tocl actuating mechanism associated with saidstandard.

13. In a tool supporting and operating fixture, a base, an uprightstandard mounted for a swinging movement upoa said base, and a bracketilidably carried by said standard for s vinging movement therewith andhaving means for supporting a device for driving the tool, said meanscomprising pairs of vertically spaced V-shaped arms adapted to embrace apart of said drive device. said arms being held in connected spacedrelation by a. vertical back part, id back part having sl t foradjustably receiving" a part of said drive device for securing the sameto said bracket to swing with said standard, and to accommodate drivedevices of various sizes and shapes.

let. A tool supporting and operating fixture comprising a base, anupright standard carried by said base, a second upright standard carriedby said first standariil by spaced brackets, a tool supporting memberhaving, spaced arms each slidably engaging both said standards, acontrol lever, having one end pivoted. to the upper of said brackets andits other end free. a link pivoted to said lever cl-mediate its ends andto said member, said upper bracket being vertically adjustable alongsaid standard to swing said lever about said link and vary the uppermostposition of the free end of said lever and to vary the upper limit ofmovement of said member.

15 A tool supporting and operating fixture comprising a base, an uprightstandard adjustably carried by said base, another and spaced uprightstandard supported by and adjustable with said first-mentioned standard,a tool supporting and actuating member "raving spaced arms slidablycarried by both said standards, means for sliding said member verticallyalong said standards, an adjustable stop carried by said second-namedstandard beneath said member and engaged by the lower arm of said memberin its lowermost position, and another adjustable stop carried by saidsecond standard and engaged by the upper arm of said member in its uppermost position.

16. A tool supporting and operating fixture comprising a base, anupright standard rotatably carried by said base, another uprightstandard carried by said first-mentioned standard and rotatabletherewith, a tool supporting and actuating member having spaced armsslidably carried by both said standards, means for sliding said membervertically along said standards, and adjustable means carried by saidsecond-named standard for varying the extent of movement of said memberand the length of the stroke of the tool.

17. A tool supporting and operating fixture comprising a base, anupright standard swingably carried by said base, another uprightstandard carried by and swingable with said first-mentioned standard, atool supporting and actuating member having spaced arms slidably carriedby both said standards, means for sliding said member vertically alongsaid standards, and adjustable means carried by said second-namedstandard for varying the upper or lower or both limits of movement ofsaid member.

18. A tool supporting and operating fixture comprising a base, uprighttool-supporting standards carried by said base, a tool supporting andactuating member slidably carried by one of said standards, means forsliding said member vertically along said standards, and adjust-ablemeans carried by one of said standards for varying the upper or lower orboth limits of movement of said member and additional means adiustablycarried by one of said standards for independentlv varying the saidupper limit or range of movement of said member.

19. A tool fixture comprising a base havan upstanding hollow cylindricalpart, a hollow bushing secured in and projecting above said cylindricalpart, a horizontal arm having a split sleeve at one end engaging theprojecting part of said bushing to permit said arm to be rotatablyadjusted thereupon, means for clamping said sleeve upon said bushing forsecuring said arm in any of its adjusted positions, a split sleeve atthe other end of said arm, an upright post supported by said lattersleeve for rotary adjustment relative thereto, means for clamping saidlatter sleeve to said post for securing the post in any of its rotarypositions, a support for the tool and its actuating mechanism havingprojecting arms slidably carried by said post, and means for slidingsaid support along said post.

20. In a tool supporting and actuating fisturma base, an upright post,tool suppoiting and actuating members carried by said-post, and acompound rotary swinging joint between said base and said post,including a radial member swing-connected to both said base and post andclamp means for se curing said post and associated parts in any of itsswinging positions.

In testmony whereof, I have subscribed my name.

HERMAN W. ZIMMERMAN.

